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Category:   Application (Web Server/CGI)  >   Compaq Secure Web Server Vendors:   HPE
(HP Issues Fix for CSWS) Apache ap_resolve_env() Buffer Overflow in Reading Configuration Files May Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1011677
SecurityTracker URL:  http://securitytracker.com/id/1011677
CVE Reference:   CVE-2004-0747   (Links to External Site)
Date:  Oct 14 2004
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.2, 1.3, 2.0
Description:   A vulnerability was reported in Apache in the processing of configuration and access control files. A local user may be able to execute arbitrary code.

The Swedish IT Incident Centre (SITIC) reported that a local user can create a specially crafted '.htaccess' or 'httpd.conf' file to trigger a buffer overflow in Apache. The overflow occurs in the expansion of environment variables contained in the files. The overflow resides in the ap_resolve_env() function in 'server/util.c'.

A local user with the ability to create a malicious '.htaccess' file may be able to gain elevated privileges on the target system.

Ulf Harnhammar is credited with discovering this flaw.

Impact:   A local user may be able to gain the privileges of the web server process.
Solution:   HP has issued patch kits, available at:

http://h71000.www7.hp.com/openvms/products/ips/apache/csws_patches.html

For CSWS Version 2.0:

CPQ-AXPVMS-CSWS20_UPDATE-V0100--4.PCSI_SFX_AXPEXE (CSWS 2.0 Update 1)
with
CSWS20_UPDATE-V0100_README.TXT (September 2004)

For CSWS Version 1.3:

CPQ-AXPVMS-CSWS13_UPDATE-V0600--4.PCSI-DCX-AXPEXE (CSWS 1.3 Update 6)
with
CSWS13_UPDATE-V0600_README.TXT (September 2004)

For CSWS Version 1.2:

CPQ-AXPVMS-CSWS12_UPDATE-V0800--4.PCSI-DCX-AXPEXE (CSWS 1.2 Update 8)
with
CSWS12_UPDATE-V0800_README.TXT (September 2004)

For CSWS_PHP Version 1.2:

CPQ-AXPVMS-CSWS_PHP12_UPDATE-V0100--4.PCSI_SFX_AXPEXE (CSWS_PHP 1.2 Update 1)

Vendor URL:  www.hp.com/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  OpenVMS
Underlying OS Comments:  7.2-2 or later

Message History:   This archive entry is a follow-up to the message listed below.
Sep 16 2004 Apache ap_resolve_env() Buffer Overflow in Reading Configuration Files May Let Local Users Gain Elevated Privileges



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